40128631 has 2 divisors, whose sum is σ = 40128632. Its totient is φ = 40128630.

The previous prime is 40128623. The next prime is 40128643. The reversal of 40128631 is 13682104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40128631 - 2³ = 40128623 is a prime.

It is a super-2 number, since 2×40128631² = 3220614051868322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40128596 and 40128605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40128131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20064315 + 20064316.

It is an arithmetic number, because the mean of its divisors is an integer number (20064316).

Almost surely, 2^40128631 is an apocalyptic number.

40128631 is a deficient number, since it is larger than the sum of its proper divisors (1).

40128631 is an equidigital number, since it uses as much as digits as its factorization.

40128631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 40128631 is about 6334.7163314548. The cubic root of 40128631 is about 342.3613902688.

The spelling of 40128631 in words is "forty million, one hundred twenty-eight thousand, six hundred thirty-one".